Democrats who filed for the position include Letitia Plummer, Margarita Ruiz Johnson, Sri Preston Kulkarni, Steve Brown and Mark Gibson. Gibson lost to Olson in the 2016 general election by about 9 percent, according to Community Impact Newspaper's media partner, The Texas Tribune.
U.S. House District 22 covers parts of Pearland, Richmond, Sugar Land and Katy.
The 2018 primary election will be held March 6, with the general election following on Nov. 6. For more information about 2018 elections in Fort Bend County, click here.